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import java.util.Collection;

import java.util.Collections;

import java.util.HashMap;

import java.util.HashSet;

import java.util.Iterator;

import java.util.LinkedHashMap;

import java.util.LinkedHashSet;

import java.util.LinkedList;

import java.util.List;

import java.util.Set;

import java.util.SortedSet;

import org.testng.annotations.DataProvider;

import org.testng.annotations.Test;

import static org.testng.Assert.assertTrue;

import static org.testng.Assert.fail;

import java.util.TreeMap;

import java.util.TreeSet;

import java.util.concurrent.ConcurrentHashMap;

import java.util.concurrent.ConcurrentSkipListMap;

import java.util.function.Predicate;

import java.util.function.Supplier;

/**

 * @test

 * @summary Unit tests for extension methods on Collection

 * @library testlibrary

 * @build CollectionAsserts CollectionSupplier ExtendsAbstractSet ExtendsAbstractCollection

 * @run testng CollectionDefaults

 */

public class CollectionDefaults {

    public static final Predicate<Integer> pEven = x -> 0 == x % 2;

    public static final Predicate<Integer> pOdd = x -> 1 == x % 2;

    @SuppressWarnings("unchecked")

    private static final Supplier<?>[] TEST_CLASSES = {

        // Collection

        ExtendsAbstractCollection<Integer>::new,

        // Lists

        java.util.ArrayList<Integer>::new,

        java.util.LinkedList<Integer>::new,

        java.util.Vector<Integer>::new,

        java.util.concurrent.CopyOnWriteArrayList<Integer>::new,

        ExtendsAbstractList<Integer>::new,

        // Sets

        java.util.HashSet<Integer>::new,

        java.util.LinkedHashSet<Integer>::new,

        java.util.TreeSet<Integer>::new,

        java.util.concurrent.ConcurrentSkipListSet<Integer>::new,

        java.util.concurrent.CopyOnWriteArraySet<Integer>::new,

        ExtendsAbstractSet<Integer>::new

    };

    private static final int SIZE = 100;

    @DataProvider(name="setProvider", parallel=true)

    public static Iterator<Object[]> setCases() {

        final List<Object[]> cases = new LinkedList<>();

        cases.add(new Object[] { new HashSet<>() });

        cases.add(new Object[] { new LinkedHashSet<>() });

        cases.add(new Object[] { new TreeSet<>() });

        cases.add(new Object[] { new java.util.concurrent.ConcurrentSkipListSet<>() });

        cases.add(new Object[] { new java.util.concurrent.CopyOnWriteArraySet<>() });

        cases.add(new Object[] { new ExtendsAbstractSet<>() });

        cases.add(new Object[] { Collections.newSetFromMap(new HashMap<>()) });

        cases.add(new Object[] { Collections.newSetFromMap(new LinkedHashMap()) });

        cases.add(new Object[] { Collections.newSetFromMap(new TreeMap<>()) });

        cases.add(new Object[] { Collections.newSetFromMap(new ConcurrentHashMap<>()) });

        cases.add(new Object[] { Collections.newSetFromMap(new ConcurrentSkipListMap<>()) });

        cases.add(new Object[] { new HashSet<Integer>(){{add(42);}} });

        cases.add(new Object[] { new ExtendsAbstractSet<Integer>(){{add(42);}} });

        cases.add(new Object[] { new LinkedHashSet<Integer>(){{add(42);}} });

        cases.add(new Object[] { new TreeSet<Integer>(){{add(42);}} });

        return cases.iterator();

    }

    @Test(dataProvider = "setProvider")

    public void testProvidedWithNull(final Set<Integer> set) throws Exception {

        try {

            set.forEach(null);

            fail("expected NPE not thrown");

        } catch (NullPointerException expected) {

                ; // expected

            }

        try {

            set.removeIf(null);

            fail("expected NPE not thrown");

        } catch (NullPointerException expected) {

               ; // expected

        }

    }

    @Test

    public void testForEach() throws Exception {

        final CollectionSupplier<Collection<Integer>> supplier = new CollectionSupplier((Supplier<Collection<Integer>>[]) TEST_CLASSES, SIZE);

        for (final CollectionSupplier.TestCase<Collection<Integer>> test : supplier.get()) {

            final Collection<Integer> original = test.expected;

            final Collection<Integer> set = test.collection;

            try {

                set.forEach(null);

                fail("expected NPE not thrown");

            } catch (NullPointerException expected) {

                ; // expected

            }

            if (set instanceof Set && !((set instanceof SortedSet) || (set instanceof LinkedHashSet))) {

                CollectionAsserts.assertContentsUnordered(set, original, test.toString());

            } else {

                CollectionAsserts.assertContents(set, original, test.toString());

            }

            final List<Integer> actual = new LinkedList<>();

            set.forEach(actual::add);

            if (set instanceof Set && !((set instanceof SortedSet) || (set instanceof LinkedHashSet))) {

                CollectionAsserts.assertContentsUnordered(actual, set, test.toString());

                CollectionAsserts.assertContentsUnordered(actual, original, test.toString());

            } else {

                CollectionAsserts.assertContents(actual, set, test.toString());

                CollectionAsserts.assertContents(actual, original, test.toString());

            }

        }

    }

    @Test

    public void testRemoveIf() throws Exception {

        final CollectionSupplier<Collection<Integer>> supplier = new CollectionSupplier((Supplier<Collection<Integer>>[]) TEST_CLASSES, SIZE);

        for (final CollectionSupplier.TestCase<Collection<Integer>> test : supplier.get()) {

            final Collection<Integer> original = test.expected;

            final Collection<Integer> set = test.collection;

            try {

                set.removeIf(null);

                fail("expected NPE not thrown");

            } catch (NullPointerException expected) {

                ; // expected

            }

            if (set instanceof Set && !((set instanceof SortedSet) || (set instanceof LinkedHashSet))) {

                CollectionAsserts.assertContentsUnordered(set, original, test.toString());

            } else {

                CollectionAsserts.assertContents(set, original, test.toString());

            }

            set.removeIf(pEven);

            for (int i : set) {

                assertTrue((i % 2) == 1);

            }

            for (int i : original) {

                if (i % 2 == 1) {

                    assertTrue(set.contains(i));

                }

            }

            set.removeIf(pOdd);

            assertTrue(set.isEmpty());

        }

    }

}